Radio wave scattering in the galactic disk

Details Radio wave scattering in the galactic disk Radio wave scattering in the galactic disk

Jun 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984natur.309..689c&link_type=abstract

Nature (ISSN 0028-0836), vol. 309, June 21, 1984, p. 689-691. Research supported by the National Astronomy and Ionosphere Center

Astronomy and Astrophysics

Astronomy

34

Galactic Structure, Interstellar Gas, Milky Way Galaxy, Radio Astronomy, Radio Scattering, Electron Density (Concentration), H Ii Regions, Pulsars, Scintillation, Synchrotron Radiation, Very Long Base Interferometry

Scientific paper

Recent scattering measurements using very long baseline interferometry and interplanetary scintillations of extragalactic sources, and interstellar scintillations of pulsars are used here to constrain the distribution of scattering material in the Galaxy. Although ubiquitous, scattering material appears to be highly concentrated in a thin disk of about 100 pc thickness and in clumps of 1-10 pc size probably associated with H II regions, stellar wind bubbles, and/or supernova shocks. Typical transverse velocities of scattering material are much smaller than typical pulsar velocities. The scattering angle is predicted as a function of galactic latitude. The results imply a maximum observable surface brightness for incoherent sources of electron synchrotron radiation.

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